The invention discloses a postoperative breast cancer rehabilitation device. The device comprises a base, wherein the top of the base is fixedly connected with a mounting plate, the left and right sides of the mounting plate are provided with upper limb practice assemblies respectively, the portion, located under the upper limb practice assemblies, of the front face of the mounting plate is provided with a preliminary practice assembly, the base is provided with a lifting assembly, the lifting assembly is provided with a seat assembly, each upper limb practice assembly comprises a groove, andthe tops and bottoms of the inner surfaces of the grooves are communicated with mounting grooves respectively. The postoperative breast cancer rehabilitation device has the advantages that the upper limbs and shoulders of a patient all can be moved, and the air pressure can be adjusted through a pressure adjusting assembly according to the recovery condition of the patient, by matching different pressures to the patients with different recovery degrees, the use is more convenient, the recovery of the patient is facilitated, and the fist making and wrist exercises of the patient shortly after an operation are facilitated, a seat is also arranged, and the seat can be adjusted in height.